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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '903c3cf73880742ff0eb9e2acb0363feceded2b64f006056995401cc24a0ce68' 
  AND token = 'O9bqEfPjmgOkfBkkxpRjHsTTmEq5Ad08LTpup7HB664=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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