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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a9b64f603621d447a3713edcb8b70edd929019feb7dd217f803ccc438af8923' 
  AND token = 'XgYYxP50eYsQ42cni40+Jb7WYoSbhVp3Mu33KwrKkrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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