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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21c7986ef88cbae3e6d110256ce4735597308f57ef8e039ea373d447c4c35a3d' 
  AND token = 'ItI+YGyM3q01s8h0cCofMsq8iOheAwA+dO9xL3oJpQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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