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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbc3c65524431ead360e02b38c691410f8e15c046932dc5ab4033a1a221c21da' 
  AND token = '6TFNxbD/vXEIfeyqxakTjHENj3WnaWNijHOadWTOwdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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