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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5e9f1636a7368ecae7b4920495d5cf967d1284c0e583760901d393f50cca9a4' 
  AND token = 'FnNagQ4eAFYPG3vAxi8OAh8TXUC8rI9OxsY0UvdLXME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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