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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5690eb7439220cbd1bace79ae68b011595cf31dcd1b0b23f4678f71e1a8fc409' 
  AND token = 'TnJ/jkNeSa2BAm8URflQjvIFbF1LjbSmvtH3SA2000E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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