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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39fd30a1f05193c170dad325b57f08cbe03f1ad01970c994d1d9c0dfa155507f' 
  AND token = '/Ngye8JvO9EJikOGYcgvG4/+NALDXDWWQErIkuIi5/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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