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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b17b1f5f72ca4c50c879d704c7f8e0c0035d46989dda4a63f94d651fb34fd93' 
  AND token = 'YzNHzDmXYO1cIRku7ZRmUN9NwF+85Yogo8FZMvAoebU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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