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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c666d1b38df085bddf99dfc36abe962a0ceb7b5a0bd4902d049098585fe40c48' 
  AND token = 'QX8HSaA7CeO2QZWqi/Wlx13m911teJ7MlUSXELDWT6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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