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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d0c16b712addfd6923a488e29ebdf32a9f7ab2e32db422f3b4f7fc14b2734e2' 
  AND token = 'W1H0n4OX/y+utiougEKkiPAj/pi4GtOJZadqZEHZe58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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