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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7e2f22692702e356cc5ffd07a60b8cba322d5c825825c9736f76736312e0917' 
  AND token = 'Qa0FSkVATKw62ITGmPQkUDhEe8lLrpP1gO5NSXo4R/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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