SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9452b63303bf59896b38b0661ef845bfe38a5eaed97eaa48412ab2a111dc6bf1' 
  AND token = 'Jp++KqPBqRDcBpXjH6Yr86nJmk5FEJDK/gW0kKFxNBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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