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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28d100d5cc451fdd52e9d3efc583c92b6ba15335475b379373530ad96aff13cc' 
  AND token = '6ZaAAmN8fIspLsjk8UdCQvZdO90qlz9tCG45AhFsA7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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