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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be87e0a302958e732b0daddc20234a39200dd6d3712fabb583a9b680e6e98e4' 
  AND token = '9pnaMbZwa5s54WIJ0F9Qf8clScnzH2ZCVa+NnIuq2VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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