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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4492bf090d800ff34f17e8bd4cfd7891b0df56469a7f83250ce456fc0346aef' 
  AND token = 'jsCTwySO992/92pF0U1usmyk/pf2AN09HC9Amk7W44Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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