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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ada8b3c7bb88a92ad1760aae8caef07c69cb386eafa120e9669bed2ea038c3b' 
  AND token = 'FsZwTVTRbmn/3CvLucjXle1O3YyZjFCsdM+9uMW7Jrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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