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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '837d68002f2536259c688b551b4d35bee4b66a8ec7c3a3fbf403c6e955678c50' 
  AND token = 'VSBefOJX6J2ZMWeKxO8mnJRhoglrgb2lPBF39rR6VWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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