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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a7e3c9b0621fe13279e91cb27869d7432a8a6ca6c59f64572ca92574f3c1a7c' 
  AND token = 'RAKk7dJe+Sl5C64p6B9QXbs0mWPRB0Bmm5OqcrKWb4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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