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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7082b9f4db46af56f3d0dab90447ea3cccbe25908f807f43084b3d7f398c92b4' 
  AND token = '2LEauqtQQjEJ4927scMgfo8zJyUmwKeeb+pyqRIV4bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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