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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c878de9b5de0d8183089ce178c5e81a8f82c72a6bd3166bc2d9fda6c30da6712' 
  AND token = '87Ilz53DkuR7z2YbxhsbJsiDJkNqY4EZZ801R46lVhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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