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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '724d1f6c930dc9e95f16357071d7535d842e09fad69f6e3ec821e0318df86656' 
  AND token = 'jAc2r5tlgdktxIt2TkIwjCOyxlH8V6PAMQ7bdyfagnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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