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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '551878f3d38792ba953914968990e8ece4f68e040c285381c7b7547304c8f6db' 
  AND token = 'Swp2wnxod2/EofgMcDjiCZIh4bjWtMc83yEbVz2WWrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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