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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b2cfd99efdfafe0a17fe7c1dd95c112bcdb196ea586d71a4dc6aa3d9986ab2d' 
  AND token = 'gxy4tThzHop/Y0uV21Hx/3lqDJM/hRBfaf/3AohUpKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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