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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69064c880069ff3860f5ff8fe6e9844455cfa7b2256bcc378d27c36a2d5af83a' 
  AND token = '8yqrW/GzHNphtf0K/oMFhE0/oWS92h+FSN0AG7UY+hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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