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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bbdd2b81e590ec07524a8a55df6db3e7e7d07703df32e2b16fd895c8b52d4e3' 
  AND token = '790LIdIxsR5q0jYscrmz7T424uKHZLzqKAZE6FYsIpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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