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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e05b44075c23dbafee5b2ce40e8800538a1b9e30eb335d6d84a9f48d7b1dcf9' 
  AND token = 'djHQtbt5pHblTrEG3HyNy36cfGVjFYp9qQsoE42gkHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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