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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '091c74e50f24b05a8f2729b6ec5ed20a12518b097c0d4f09209a460c5c3945b5' 
  AND token = 'bYoo5sQXiEekiOBgquNnbkk1jO7ibWYbLSrgxYqFiTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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