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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f259a5ea93c8942c635300488c2dbf6b69c4a1d51cef31d3e4f020b40e34944f' 
  AND token = 'YurtCjg/NHrxJoQOv/jVmc9N4DtDou/xWHM5NnvEOdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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