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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00f3783a47f9b15dfd36bdca7f790315d67d8caa1fecb201fb42689d849a9b34' 
  AND token = 'kntVW5sIcH3yI7lY2fkDpgBtuOQW3R9cO+K0C7oM+wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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