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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edade10f98e40abb4cf01332fe7da38e4583e0a1b936ab9c7ce6406bc232d7a7' 
  AND token = 'UaK6luFZLpYjEGOc7Rwn/YQzz36MMQtljJbiNP3enNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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