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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c253d8bb440710e95c318085c2e2c50eed98baa38be935f1e6fd23490f3bd96' 
  AND token = 'fIJIbybt233fkfEQhBcE6rvjb9cR518e8vND8z/v+g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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