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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e368aa47a163fec8d7955102cc5d56ffe83cf75c8c3861d5a4f2eae18adc1389' 
  AND token = 'Bkb9tceh4IY3NKB6NyQUM+Vk/u2tUp3VECDtLGJbktY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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