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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91500708ee10f5ed08001ce91751ab86a26c815f19e2166b7337b5b8ec56ace4' 
  AND token = 'WueJtTpoKQ+mE9yVVJ45UX2gIQaiMDRnXsgsWL9hNtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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