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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0359e8e61e36e247b3dc1ceb1975382af4ae5af9b4ce849c4b2da6e2b03a1f03' 
  AND token = '9aID8pPV4ZkqUd9xXFOce+LDnPkJxmHxxg8JY8AKbzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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