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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1db28397a5c3dbdd955ba2261df0d2c032e6d088abad2f85ff456c2e5197e26d' 
  AND token = 'jp2tqZK6LJAYrQWvJH4cCWWFukgsm6uccgHdcEublGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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