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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1b7e19ddb63955ed145f3afb68e0713a72d045b8774f5a8deda43052d25d86d' 
  AND token = 'Ytx3HexR77O1JkQv0cq5LglzDhcWEqv///8lk31T7/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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