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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97b53aaeba53982a727d272a298aa19c79f81fc559019d99e79e5c5825c4db9f' 
  AND token = '+T9Cc0ZuJUj7Iu7jXnz2r4SVGGxds84uwNrZzgSfLJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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