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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ce7cb90fd59def2ebad6b01ee91d67c0ec57535bce9bfd64085e07eba6ea0cb' 
  AND token = 'p7dp1+J5CqkQQuK41TmAqK22WuYRxpJ/COJzCUN5Xwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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