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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '449c3b9f212501ae0ff456d62a1276441c52ac5490cdd0dc4c8c9e4d5cbb1056' 
  AND token = 'sBhaIEvEFQYxGkHdG05oEvb2d4x9jEjJhRomj0bjFfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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