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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57411c7fa16d52d9c2c9a561cf21e96295bef00002e46ea1b750f57d59fd82ab' 
  AND token = 'seX+i/fpXc15vLQ5ZwhoXyrzbzhEx+jajBWlnoEuzos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}