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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed41c4873aa456f05076556b09251577d73c066bcee8f8365d23add848dc3cab' 
  AND token = 'Y/+o16vHWKFUTL5YTtjw7xgEl5oX1w/y0HbovkCWwtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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