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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd4c9cabd1402c61677dac700fe737eb18ecce41ac8e7ba3250d9ba2de119ef1' 
  AND token = 'MEWb2pQfIP9m2jbmsFfMJXo2KajClym4ZRGh+j7VgDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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