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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cacd7830a6b03ac29b6ba9f32638f81fa48dd28d970bb708d52444e5483e305c' 
  AND token = 'yGtXvEymTlXegi96YkgaBgunJKY1goNfL732MiZT974=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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