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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb1edbf993f47f455309c9398be4ebda6bdc876a273b08c5e059bdfcec5b77a4' 
  AND token = 'nnF506AMd+raOvzyJXnr8sA5+9n5PIl/tdgROvnTCu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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