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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faee66498cbbdc1b59c85c9027d34334562bfe35d4b82855017ad63437b2b9d7' 
  AND token = 'zCAJaQ+dl2R4V28J+ZBweHE1pDt6WXNSrMfxT1DXtCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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