SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9379a50a2da88153042f0cb4b8eb2a9c95519587eb7d9626f8bbdab99042871e' 
  AND token = 'bZp4zuRvBeBPTlPdlHM6X1XhQg8+gcEDSHKW4sfbHqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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