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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbf7749fe8f6379b4679a792e74d330618c554d186c08d8a40ba827d9148e5cc' 
  AND token = 'f7LNdbTcxyTl6/LdJyFjGv7G9cNvy1ZXMO2kz/ReLrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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