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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a019d26c657974e4bc3117078bb5792895287a2631566e172c4d976f5eeedbf' 
  AND token = 'otEm01wRi7jIMicf3eNCiGVpDaBa78oQ+2kWXpSuZrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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