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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57d1ea9e51271662a94e63a9b2d4f8868bb94ae41e4ea166e43b8baa6d3b0be3' 
  AND token = 'rqJ7aukTuL8SfwGRjBAUNPNK4/wTwTKwqm/aGiw63GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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