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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '225332d304ec1b9e7606f3278466b3b45d4559499ba5c84c99803f707f0e1773' 
  AND token = 'AllLXsmFUNVCKyruReiH++xRee0OzWxDEu82E+gcmKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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