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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69421cbc568256f3999598c1dd100e65cfac1122794fd177b3952762079264ec' 
  AND token = 'MkU+64DE7Da8j29tZmLlge8widKbFtoen2HefrEDie8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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