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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5cc362caa623e0dab27d640bddc64aeb2138058da16a211ffb9fb3180ba812e' 
  AND token = 'IbR3CF2OJ8zUnNwKioayNcTpE8Uc58B0YIIrowxX/xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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