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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f87993955374c573e829381ea91c2b280561e6fb1fba5d95849f132d832f6bab' 
  AND token = '3hnKXcnfSq9gAPL49Xeu8iVUIidBPMA0e4LvwF0RXAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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