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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52b8b7f78f647b4717fd601dfd0115ae73244de7adddc17f6e40dccf512e6639' 
  AND token = '4JL0hLlnQfull5psrJrDPmp3HLlOR5aGjfMCS1VDaW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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