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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f28228812b5e2caafbfb37a15e18a03c0b4224871511351f0937de2d451f2852' 
  AND token = '62+at1zYgF6PtjxvsSYSc4sbDdRBTwJDtx6FSB5sNIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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