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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8e4b95e9f1ce409de9f29ca625d65f6a76df38df424a9551a7641226e74bd3d' 
  AND token = 'FP4ugBdQ/qmvy2xO0n4dtlzQXaGk6LU4FWt0L31v9LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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