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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0c88076a0f26982bccb7cc776a5dae9b499de579fc13e3264cb386e2c220332' 
  AND token = 'pRqPLwtY6jufcceRGKOKBOn4ubl+G4xWkwC9rEsZeu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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