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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ee55c4a847938d1a923dfa962a7a87fa6683deef1d5900a25c92147335e22d0' 
  AND token = 'QlTI62e4YkHdNp7L48XbnGouVSZuwb7sNCJM778S3c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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